C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Transmission Fluid

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Old Apr 30, 2026 | 04:31 PM
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Default Transmission Fluid

Changing some of my fluids/ oil on my new to me 95 ZR-1.
What is the tranny fluid of choice you guys are using? TIA
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Old May 1, 2026 | 12:48 AM
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Hey... Marc Haibeck recommends Amsoil 5W-30 Synthetic. Rear axle, Amsoil 75W-90 Synthetic, and engine oil, Amsoil AMO 10W-40 Synthetic. That's what's in mine!

Mike
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Old May 1, 2026 | 12:49 AM
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I have the GM 88900333 in my ZR-1. It replaced what was very likely the original factory fill with about 22k miles on it. It drives the same and I cannot feel any difference in the shift quality.
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Old May 1, 2026 | 05:31 PM
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Originally Posted by beermanpete
I have the GM 88900333 in my ZR-1. It replaced what was very likely the original factory fill with about 22k miles on it. It drives the same and I cannot feel any difference in the shift quality.
Beerman,how come when I look that p/n up under the gm or ac delco it says part does not fit? It's obviously ok if your running it.
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Old May 1, 2026 | 06:59 PM
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I don't know about that. I know the original gear oil called for in the manual supersedes to this oil. The fit guidelines are suspect at best.
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Old May 1, 2026 | 07:42 PM
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Originally Posted by beermanpete
I don't know about that. I know the original gear oil called for in the manual supersedes to this oil. The fit guidelines are suspect at best.
Your probably correct; I just picked up 3 qt's at my Chevy dealer. I used GM reward points so no cash involved😄
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Old May 1, 2026 | 09:06 PM
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I just bought 3 bottles of this:
AMSOIL 5W-30 Manual Synchromesh Transmission Fluid 3
Package Size: Quart Bottle
Qty: 3Order Details


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